基于CCSDS标准的串行级联卷积码高速并行译码方法

High Throughput Parallel Decoding Method for Serial Concatenated Convolutional Codes Based on CCSDS Standard

针对CCSDS标准中串行级联卷积码(SCCC)的自适应编码调制方式的定义,分析比较了Log-MAP算法和基于乘性修正的Max-Log-MAP算法的译码性能和实现复杂度;提出了一种可支持多种编码方式的通用、低复杂度、高编码增益的并行译码方法.基于FPGA硬件平台进行原理验证,实现了一个可同时支持8种编码方式的高速并行、高吞吐量、低时延的SCCC译码器,译码器最高吞吐量可达300 Mbit/s.

According to serial concatenated convolutional codes（SCCC）adaptive coded modulation scheme defined in the consultative committee for space data systems（CCSDS）standard,Log-MAP algorithm and Max-Log-MAP algorithm with multiplicative correction were analyzed and compared in the decoding performance and implementation complexity.On the basis of these studies,aparallel decoding method with low complexity and high coding gain was proposed in this paper.Furthermore,ageneral and parallel decoding structure,supporting a variety of coded modulation schemes,was provided.Finally,based on FPGA hardware platform,a high-speed,parallel and high-throughput SCCC decoder was designed for eight coded modulation schemes.The testing result indicates that the maximum throughput can be up to 300 Mbit/s.